Took me far to long to understand the mechanic. When I finally did, I wasn't really motivated to play for too long as it just wasn't satisfying enough. With lots more juice, faster fire rate etc maybe I'd have liked it more. In my fourth or fifth go, I finally scored 1 point. How disappointing! I eventually managed 20, but didn't feel the need to continue.
Good effort anyway, you can feel satisfied that you've built a working game in 48 hours, which is an achievement in itself!